EP0649267A2 - Système cellulaire pour les paquets de données - Google Patents

Système cellulaire pour les paquets de données Download PDF

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Publication number
EP0649267A2
EP0649267A2 EP94306920A EP94306920A EP0649267A2 EP 0649267 A2 EP0649267 A2 EP 0649267A2 EP 94306920 A EP94306920 A EP 94306920A EP 94306920 A EP94306920 A EP 94306920A EP 0649267 A2 EP0649267 A2 EP 0649267A2
Authority
EP
European Patent Office
Prior art keywords
mobile
base station
active
beacon signal
list
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94306920A
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German (de)
English (en)
Other versions
EP0649267B1 (fr
EP0649267A3 (fr
Inventor
Zygmunt Haas
Chih-Lin I
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
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AT&T Corp
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Filing date
Publication date
Application filed by AT&T Corp filed Critical AT&T Corp
Publication of EP0649267A2 publication Critical patent/EP0649267A2/fr
Publication of EP0649267A3 publication Critical patent/EP0649267A3/fr
Application granted granted Critical
Publication of EP0649267B1 publication Critical patent/EP0649267B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the instant invention is directed to a packetized, cellular system.
  • it relates to such a system that requires a limited amount of real-time processing to determine the association of a mobile with a base station for channel assignments and hand-off purposes.
  • wireless data communications such as mobile computing, wireless messaging, facsimile, file transfer, and database access.
  • packetized cellular communications is becoming more and more important, and is being considered as the third generation of wireless networks.
  • Typical cellular networks are comprised of a large number of base stations. Each base station has an assigned coverage area (i.e. cell).
  • the cellular phone of the mobile is powered on and it scans the frequencies of a group of control channels for the strongest reception available. Once the appropriate control channel has been selected there is an exchange of messages between the base station and the mobile phone wherein the called terminal number is forwarded to the base station and a transmission channel is allocated to the mobile phone.
  • a mobile terminal that is leaving the coverage area of one base station must be "handed-off" to the next base station, whose coverage is the one the mobile is entering.
  • this hand-off process is done via continuous communications between the base station and the mobile.
  • Such a technique has its own system-level switching and control capability - a higher layer in the mobile network, operating above the individual cells.
  • the mobile may initiate the handing-off of its call in progress to another cell.
  • Such switching of a call is done "on-the-fly" without dropping or disrupting the call in progress.
  • substantial overlap in coverage areas between adjacent cells is required to insure high quality reception during hand-offs.
  • future mobile platforms may be battery power and computation power limited. Thus, simpler procedures that reduce the amount of processing by the mobile platform may be required.
  • the foregoing problems are overcome by the instant technique which is characterized by transmitting a quasi-periodic beacon signal containing ID information from active mobiles to a base station for storage in a database list therein.
  • the database list of the ID information of the active mobiles is periodically transmitted from each base station to all base stations in adjacent cells for storage therein on a non-active mobile list.
  • control of a mobile moving from a first cell to a second cell is handed-off from a base station in the first cell to a second base station, in an adjacent cell into which the mobile is moving, upon the receipt of the beacon signal of the mobile at the second base station.
  • the instant technique may be used for the purpose of resource (i.e. transmission channel) allocation.
  • a mobile requiring a number of data slots on a transmission channel may also transmit a request for an allocation of that number of slots along with the ID information on the beacon signal. Upon receipt of such a request the base station will reserve the slots on the selected transmission channel.
  • Fig. 1 depicts a cellular network in which the instant invention is implemented.
  • Fig. 1 depicts a portion of an exemplary cellular system 5.
  • the system 5 is typically comprised of a plurality of cells 6, each having a single base station 10 located therein. Any two adjacent cells 6 overlap in an "overlap" area 12.
  • a mobile 14 i.e. vehicle, airplane, hand-held portable, etc.
  • the base stations 10 are interconnected by a terrestrial network 16.
  • the mobile 14 scans the frequencies of a group of control channels, transmitted by the base station 10, for the strongest reception available. Once a control channel has been selected there is an exchange of messages between the base station 10 and the mobile 14 wherein the called terminal number is forwarded to the base station over the wireless link 15.
  • the base station 10 is connected to the destination terminal by the terrestrial network 16, wireless links 15 or both.
  • the instant packetized, cellular system 5 permits free roaming of mobiles 14 among cells 6 throughout the total coverage area.
  • a mobile 14 can be either in the powered or “on” state or in the power “off” state, referred to herein as “active” and “non-active", respectively.
  • the mobile 14 When in the active state the mobile 14 is associated with an ID number.
  • Each user is allocated a worldwide unique ID.
  • These ID numbers can be, for example, similar to telephone numbers, or can be comprised of the user's home Internet Packet (IP) address, concatenated with a user login.
  • IP Internet Packet
  • the ID number need not be fixed to a mobile 14 but the ID of the mobile 14 can change based upon the mobile's current user (i.e. the mobile assumes the user's ID).
  • ID numbers identify people and not only terminal devices.
  • more than one user is associated with the same mobile 14 that mobile may be assigned a special ID.
  • the present hand-off scheme uses a separate, universal signaling channel (S-channel) that is continuously monitored by every base station 10.
  • S-channel is a control channel which is used to establish, maintain, update and terminate the associations of the mobiles 14 with the base stations 10. Once such associations are created, there is a separate set of transmission channels that is used for the actual transfer of information, as well as for the set-up and termination procedures.
  • every active mobile 14 emits a beacon signal, on the S-channel, which includes it's ID information.
  • the beacon transmission period has some built-in jitter.
  • Such a beacon signal is referred to as “quasi-periodic” herein.
  • the periodicity is "average periodicity”.
  • the jitter is required to eliminate correlation of collisions in order to avoid the situation where two colliding beacons will collide forever.
  • the jitter should be on the order of several beacon transmission times.
  • each base station 10 Using the ID numbers transmitted on the beacon each base station 10 maintains a database list of the mobiles 14 in its coverage area - called active mobiles. In addition, each base station 10 maintains in its database a list of all the active mobiles 14 in the neighboring cells 6 which are locally referred to as non-active mobiles. This information is made available by periodic dissemination of the list of active mobiles 14 in each base station 10 coverage area to its adjacent cells 6 through the terrestrial network 16. In addition to the list of the ID numbers of the active mobiles 14 in the coverage area of a base station 10 this information exchange also includes the address of the destinations of the connections (if such exist) of the active mobiles 14 in the coverage area of the base station and the transmission channel numbers associated with the active mobiles.
  • the beacon signal can incorporate the number of slots required to accommodate the data to be sent over a transmission channel by a mobile 14.
  • the base station 10 then allocates this number of slots in the selected transmission channel.
  • this allocation technique can conserve substantial resources (i.e. transmission channels).
  • a base station 10 In operation, when a base station 10 receives an ID number and a call destination number of a mobile 14 from a neighbor cell 6 (in which the mobile is active) it sets-up a dormant connection to the call destination terminal. Thus, when the mobile 14 moves into the coverage area of the base station 10 (i.e. when the base station receives the mobile's beacon ID) it updates the status of the mobile 14 to active and assigns a channel to that mobile - the association between the mobile and the base station 10 has been created.
  • a mobile 14 may be associated with more than one base station 10 at the same time (e.g. when located in the overlap area 12).
  • the hand-off mechanism is fully transparent to the mobile 14 which may not know what base station 10 it is associated with.
  • a base station 10 When a base station 10 fails to receive a beacon from an active mobile 14 for a period of "time-out", the base station 10 determines that the mobile 14 has left its coverage area. The ID number of the mobile 14 is then made non-active in the database and the connection to the mobile destination is also made dormant.
  • a mobile 14 may be considered active in more that one base station 10, while in the overlapping area 12.
  • the mobile packets may be duplicated. It is the responsibility of the terrestrial network 16 to identify the duplicates and remove them from the network 5. In some cases, the end points (e.g. transport protocols) may need to eliminate the duplicates.
  • the duplicates correspond to some inefficiency in the terrestrial network 16. However, since the terrestrial network 16 is not the capacity bottleneck, this inefficiency does not pose a significant disadvantage.
  • a separate S-channel is used to continuously monitor every base station 10.
  • An exemplary S-channel used in the instant system is based on transmission without coordination as in the ALOHA scheme which is described in detail in COMPUTER NETWORKS, by A.S. Tanenbaum, 1991, pages 253 to 265 and is incorporated by reference herein.
  • the ALOHA scheme lets the users (i.e. mobiles) transmit whenever they have data to be sent. There will be collisions, of course, and the colliding packets will be destroyed. If the packet was destroyed, the sender waits a random amount of time and sends again. The waiting time must be random or the same packets will collide over and over, in lockstep.
  • the beacon signal from each mobile 14 to the associated base station 10 may be transmitted only when the mobile is within a predetermined distance from the overlap area 12.
  • a predetermined distance may be ascertained by measuring the signal power between the mobile 14 and the base station 10. When the power level falls below a predetermined level the quasi-periodic beacon signal is initiated.
  • the bit-error rate of the signal can be monitored by the base station 10 and/or the mobile 14. A bit-error rate above a predetermined threshold would trigger the operation of the quasi-periodic beacon signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
EP94306920A 1993-10-04 1994-09-21 Système cellulaire pour paquets de données comprenant des stations mobiles envoyant périodiquement une information d' identification à la station de base Expired - Lifetime EP0649267B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13096593A 1993-10-04 1993-10-04
US130965 1993-10-04

Publications (3)

Publication Number Publication Date
EP0649267A2 true EP0649267A2 (fr) 1995-04-19
EP0649267A3 EP0649267A3 (fr) 1995-07-12
EP0649267B1 EP0649267B1 (fr) 2002-02-06

Family

ID=22447239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94306920A Expired - Lifetime EP0649267B1 (fr) 1993-10-04 1994-09-21 Système cellulaire pour paquets de données comprenant des stations mobiles envoyant périodiquement une information d' identification à la station de base

Country Status (5)

Country Link
US (1) US5577168A (fr)
EP (1) EP0649267B1 (fr)
JP (1) JP2928104B2 (fr)
CA (1) CA2123736C (fr)
DE (1) DE69429798T2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001056232A2 (fr) * 2000-01-28 2001-08-02 Qualcomm Incorporated Procede et appareil d'optimisation de canaux au cours des demandes de sessions de protocole point-a-point (ppp)
US6898429B1 (en) 1999-03-10 2005-05-24 Nokia Networks Oy Identifier allocation method
US7197017B1 (en) 2000-01-04 2007-03-27 Qualcomm, Incorporated Method and apparatus for channel optimization during point-to-point protocol (PPP) session requests
US7773547B2 (en) 2000-01-04 2010-08-10 Qualcomm Incorporated Method and apparatus for requesting point-to-point protocol (PPP) instances from a packet data services network
US9668133B2 (en) 2003-01-28 2017-05-30 Cellport Systems, Inc. Secure telematics

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CA2118273C (fr) * 1993-11-23 2000-04-25 Pi-Hui Chao Methode et appareil d'affectation dynamique des canaux pour systeme de communication sans fil
US6081720A (en) * 1996-06-28 2000-06-27 Hughes Electronics Corporation Method and apparatus for allocating shared communication channels
US6414962B1 (en) 1998-03-02 2002-07-02 Telefonaktiebolaget Lm Ericsson Method and apparatus for caching location information of transmitting mobile stations
US6580699B1 (en) * 1999-03-29 2003-06-17 Nortel Networks Limited Method for updating an R-P connection for a roaming mobile station
US6430395B2 (en) * 2000-04-07 2002-08-06 Commil Ltd. Wireless private branch exchange (WPBX) and communicating between mobile units and base stations
KR100364368B1 (ko) * 2000-10-18 2002-12-12 엘지전자 주식회사 블루투스 기술을 이용한 사설 네트워크 및 이를 이용한통신 방법
JP3968514B2 (ja) * 2002-07-05 2007-08-29 ソニー株式会社 無線通信システム、無線通信装置及び無線通信方法、並びにコンピュータ・プログラム
JP3849647B2 (ja) * 2003-01-23 2006-11-22 ソニー株式会社 無線通信システム、無線通信装置及び無線通信方法、並びにコンピュータ・プログラム
JP4396416B2 (ja) * 2003-10-24 2010-01-13 ソニー株式会社 無線通信システム、無線通信装置及び無線通信方法、並びにコンピュータ・プログラム
US7711361B2 (en) * 2004-11-24 2010-05-04 Azalea Networks Method and system for distributed roaming services for mobile users on wireless mesh networks
TW200629188A (en) * 2005-02-04 2006-08-16 Sin Etke Technology Co Ltd Traffic control system using short-range beacons
US7801526B2 (en) * 2005-03-29 2010-09-21 Motorola, Inc. Methods for informing subscribers of adjacent sites
US7369852B2 (en) * 2005-04-27 2008-05-06 Motorola, Inc. Methods for informing subscribers in a channelized network of adjacent sites
EP1748665A1 (fr) * 2005-07-27 2007-01-31 Mitsubishi Electric Information Technology Centre Europe B.V. Procédé de transfert d'informations concernant au moins un terminal mobile dans un réseau de télécommunication mobile.
EP1892978B1 (fr) * 2006-08-22 2019-01-02 Mitsubishi Electric R&D Centre Europe B.V. Méthode et appareil pour l'implémentation de transfert de contenu multimédia dans une cellule d'un réseau de télécommunication sans fil
US8027293B2 (en) 2007-07-16 2011-09-27 Cellport Systems, Inc. Communication channel selection and use
US8385293B2 (en) * 2007-08-31 2013-02-26 Samsung Electronics Co., Ltd. Cell base station neighbor list self configuration
US7826836B2 (en) * 2007-08-31 2010-11-02 Samsung Electronics Co., Ltd. Cell base station virtual RF cage
US20090059868A1 (en) * 2007-08-31 2009-03-05 Samsung Electronics Co., Ltd. Cell Base Station Radio Frequency Channel Selection
US20090061858A1 (en) * 2007-08-31 2009-03-05 Samsung Electronics Co., Ltd. System and Method to Manage Communication Handoff
US8059614B2 (en) * 2007-08-31 2011-11-15 Samsung Electronics Co., Ltd. Pseudorandom noise selection method for mobile communication sites
US8494532B2 (en) * 2007-08-31 2013-07-23 Samsung Electronics Co., Ltd. Method to filter unauthorized mobile devices in code division multiple access networks
US9516564B2 (en) 2014-04-25 2016-12-06 At&T Intellectual Property I, L.P. Enhancement of a cell reselection parameter in heterogeneous networks
US9635566B2 (en) 2014-04-25 2017-04-25 At&T Intellectual Property I, L.P. Enhancement of access points to support heterogeneous networks
US9621294B2 (en) 2014-10-02 2017-04-11 At&T Intellectual Property I, L.P. Enhancement of inter-cell interference coordination with adaptive reduced-power almost blank subframes based on neighbor cell profile data

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EP0472511A2 (fr) * 1990-08-23 1992-02-26 Telefonaktiebolaget L M Ericsson Basculement d'une station mobile entre canaux à débits moitié et nominal
WO1992010914A1 (fr) * 1990-12-07 1992-06-25 Telefonaktiebolaget Lm Ericsson Localisation et transfert radiotelephonique utilisant des criteres alternatifs
EP0522772A2 (fr) * 1991-07-09 1993-01-13 AT&T Corp. Architecture d'interface d'accès au réseau téléphonique d'un téléphone sans fil

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Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0472511A2 (fr) * 1990-08-23 1992-02-26 Telefonaktiebolaget L M Ericsson Basculement d'une station mobile entre canaux à débits moitié et nominal
WO1992010914A1 (fr) * 1990-12-07 1992-06-25 Telefonaktiebolaget Lm Ericsson Localisation et transfert radiotelephonique utilisant des criteres alternatifs
EP0522772A2 (fr) * 1991-07-09 1993-01-13 AT&T Corp. Architecture d'interface d'accès au réseau téléphonique d'un téléphone sans fil

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6898429B1 (en) 1999-03-10 2005-05-24 Nokia Networks Oy Identifier allocation method
US7328013B2 (en) 1999-03-10 2008-02-05 Nokia Corporation Identifier allocation method
US7197017B1 (en) 2000-01-04 2007-03-27 Qualcomm, Incorporated Method and apparatus for channel optimization during point-to-point protocol (PPP) session requests
US7773547B2 (en) 2000-01-04 2010-08-10 Qualcomm Incorporated Method and apparatus for requesting point-to-point protocol (PPP) instances from a packet data services network
US8363616B2 (en) 2000-01-04 2013-01-29 Qualcomm Incorporated Method and apparatus for channel optimization during point-to-point protocol (PPP) session requests
WO2001056232A2 (fr) * 2000-01-28 2001-08-02 Qualcomm Incorporated Procede et appareil d'optimisation de canaux au cours des demandes de sessions de protocole point-a-point (ppp)
WO2001056232A3 (fr) * 2000-01-28 2002-05-30 Qualcomm Inc Procede et appareil d'optimisation de canaux au cours des demandes de sessions de protocole point-a-point (ppp)
US9668133B2 (en) 2003-01-28 2017-05-30 Cellport Systems, Inc. Secure telematics
US10231125B2 (en) 2003-01-28 2019-03-12 Cybercar Inc. Secure telematics

Also Published As

Publication number Publication date
CA2123736A1 (fr) 1995-04-05
JP2928104B2 (ja) 1999-08-03
EP0649267B1 (fr) 2002-02-06
US5577168A (en) 1996-11-19
DE69429798D1 (de) 2002-03-21
JPH07177558A (ja) 1995-07-14
DE69429798T2 (de) 2002-08-22
EP0649267A3 (fr) 1995-07-12
CA2123736C (fr) 1999-10-19

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